Improvement in triple-ribbed metallic bars



J. Y. SMITH.` Ribbed Mefauic Bar,

Patented May 15, 1866.- N

l No. 54,786.

a .W N

Z @ff-c2 a e j h//T ESSES new sectional form or `patterns or forms of the Nrrnn STATES PATENT OFFICE.

JOHN Y. SMITH, OF ALEXANDRIA, VIRGINIA, ASSIGNOR TO HIMSELF AND HERMAN HAUPT, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN TRIPLE-RIBBED METALLIC BARS` Specification forming To all Lo/0m it may concern:

Be it known that I, JOHN Y. SMITH, of Alexandria, in the county of Alexandria and State of Virginia, have invented certain new and useful Improvements in the Manufacture of Bars of Iron or other Metal, being of a shape, whereby it is peculiarly adapted and applicable in certain arts; and I hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, in which- Figure l is a longitudinal section of the die-sunk rollers for the manufacture of a bar shaped in accordance with this my invention. Figs. 2, 3, 4t are cross-sections of different bar which I call the tripleribbed 7 bar.-

The object of my invention is to produce a har of iron, steel, or other metal which, for the same weight ot' metal, is stronger and of greater stiffness than the bar of ordinary construction and form, and which, owing to its form, has a larger eld of applications and is peculiarlyT adapted to various purposes in the arts. Thus, for the manufacture of triplebitted boring or drilling1 tools according to an invention of mine for which Letters Patent ofthe United States were issued on the 23d May, 1865, and for other purposes hereinafter mentioned, this form ot' bar is ot' great utility.

I accomplish this object by constructing the bar of metal, with three projections or ribs, varying in thickness or in width, as circumstances may require, which ribs radiate from a common center, each supporting and strengthening the others.

This bar is manufactured by passing the metal through die-sunk rollers or under diesunk hammers in the manner well-known to manufacturers of iron.

The dies in the rollers or hammers, of course, are shaped to admit of the proper delivery of the bar, the surfaces of the ribs of which may either be convex or concave, according to the purpose for which it is intende( To enable others to make anduse my in vention, I shall now describe the manner in which a bar with three concave-sided ribs may be made.

part of Letters Patent No. 511,786, dated May 15, 1866.

In the drawings, A is the frame in which the rolls B O are mounted. These rolls, which may be the last of the iinishing set, are grooved to give the bar its nal shape. To this ett'ect the rolls B and C are grooved to first make a triple-ribbed bar with the ribs plane-faced, as at Fig. 2, the groove in the upper roll being shaped in conformity with the broken line a b z' c d, the angles at b and cV being ninety degrees, and that at i one hundred and twenty degrees, while the lower roll is groove'd according to the line a c g h f d, the angles at c and f being each one hundred and twenty degrees, while those at g andjt are ninety degrees each.

The iron having been rolled to assume the form shown in Fig. 2, it maybe used in this form, or it may be further modiied by fmishing it under the rolls grooved so as to give the ribs concave sides. To this effect the groove in the upper roll is shaped in conformity with the outline a b ic din Fig. 4, which is the ultimate form of the side of the bar facing this roll. T-he groove in the lower roll is preserved right-angular at the corners g and h', while the corners at c and f are slightly curved, so as to approach the form to be given the bar, without, however, interfering with the proper delivery of the bar.

To nish the bar by means of a roll grooved as described, it is necessary, after running the bar through the rolls, to turn it so as to bring the lower ribi. e., the rib which shall have been run in the lower groove-into the groove of the upper roll. Thus, by running the bar through the rolls two or three times, each time changing its position with respect to the grooves, the bar will be finished.

The bar constructed as above described can be applied with advantage to many uses. When made of steel and `ot' proper size it is especially adapted for rock-drills, reamers, and light boringtools. When of smaller diameter it can be used advantageously in place ofthe rake-teeth now in use, as it combines more strength and elasticity with lightness or less material. Still smaller in diameter, and either twisted or straight, it may be used as a lightning-rod, possessing more rigidity and used; and, generally,

strength than rods now e y 5ms@ 'this bar een be employed in every connection in which the ordinary bar is now used.

Having thus described my said invention7 nesses. and the manner in which the same is or may be carried into effect7 I claim- The manufacture of the metallic triple-ribbed bar in the manner and by the means substantially as herein described.

In testimony whereof I have signed my name to this specification before two subscribing Wit- J. Y. SMITH.

Witnesses:

EDM. F. BROWN, Jos. L. COOMBs. 

